CVE-2026-56862
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
- Published Aug 13, 2026
- CVSS 7.5 high
- 0.6% chance of exploitation in the next 30 days (EPSS)